type casting void pointer and allocate memory

type casting void pointer and allocate memory

I have two structures:
typedef struct abc {
unsigned int pref;
unsigned int port;
char *aRecordIp;
int index;
int count;
}abc_t;
typedef struct xyz {
abc_t *ab;
int index;
int count;
}xyz_t;
and I would like to achieve the following
int Lookup (char *lookup,void *handle) {
*handle = (xyz_t *)malloc(sizeof(xyz_t *));
handle->ab = (abc_t *) malloc(sizeof(abc_t *));
//
}
I am trying to typecast void pointer to xyz_t basically.
Is this correct?